Hello, syzbot found the following crash on: HEAD commit: 63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=164d5d29e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=6951e37c8d613538 dashboard link: https://syzkaller.appspot.com/bug?extid=c9e294bbe0333a6b7640 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1308bbede00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15cd8e45e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c9e294bbe0333a6b7640@xxxxxxxxxxxxxxxxxxxxxxxxx executing program BUG: memory leak unreferenced object 0xffff88811df75f40 (size 32): comm "syz-executor611", pid 7103, jiffies 4294943290 (age 13.730s) hex dump (first 32 bytes): 73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 syz............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000adefbfe2>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] [<00000000adefbfe2>] slab_post_alloc_hook mm/slab.h:586 [inline] [<00000000adefbfe2>] slab_alloc mm/slab.c:3320 [inline] [<00000000adefbfe2>] __do_kmalloc mm/slab.c:3654 [inline] [<00000000adefbfe2>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671 [<000000006e7fd3b2>] kstrdup+0x3a/0x70 mm/util.c:60 [<00000000f4f9470a>] reiserfs_parse_options+0x94c/0xe80 fs/reiserfs/super.c:1277 [<0000000080f3e2df>] reiserfs_fill_super+0x1a1/0x10e0 fs/reiserfs/super.c:1941 [<00000000f75361a0>] mount_bdev+0x1ce/0x210 fs/super.c:1417 [<00000000b8c200cc>] get_super_block+0x35/0x40 fs/reiserfs/super.c:2606 [<00000000f4439f43>] legacy_get_tree+0x27/0x80 fs/fs_context.c:622 [<000000008eb8d222>] vfs_get_tree+0x2d/0xe0 fs/super.c:1547 [<00000000367f5f92>] do_new_mount fs/namespace.c:2822 [inline] [<00000000367f5f92>] do_mount+0x97c/0xc80 fs/namespace.c:3107 [<0000000000ddb42a>] __do_sys_mount fs/namespace.c:3316 [inline] [<0000000000ddb42a>] __se_sys_mount fs/namespace.c:3293 [inline] [<0000000000ddb42a>] __x64_sys_mount+0xc0/0x140 fs/namespace.c:3293 [<00000000a60abc01>] do_syscall_64+0x73/0x220 arch/x86/entry/common.c:294 [<000000001bd2aaac>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 BUG: memory leak unreferenced object 0xffff88811df755c0 (size 32): comm "syz-executor611", pid 7103, jiffies 4294943290 (age 13.730s) hex dump (first 32 bytes): 73 79 7a 00 00 00 00 00 00 00 00 00 00 00 00 00 syz............. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000adefbfe2>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline] [<00000000adefbfe2>] slab_post_alloc_hook mm/slab.h:586 [inline] [<00000000adefbfe2>] slab_alloc mm/slab.c:3320 [inline] [<00000000adefbfe2>] __do_kmalloc mm/slab.c:3654 [inline] [<00000000adefbfe2>] __kmalloc_track_caller+0x165/0x300 mm/slab.c:3671 [<000000006e7fd3b2>] kstrdup+0x3a/0x70 mm/util.c:60 [<00000000f4f9470a>] reiserfs_parse_options+0x94c/0xe80 fs/reiserfs/super.c:1277 [<0000000080f3e2df>] reiserfs_fill_super+0x1a1/0x10e0 fs/reiserfs/super.c:1941 [<00000000f75361a0>] mount_bdev+0x1ce/0x210 fs/super.c:1417 [<00000000b8c200cc>] get_super_block+0x35/0x40 fs/reiserfs/super.c:2606 [<00000000f4439f43>] legacy_get_tree+0x27/0x80 fs/fs_context.c:622 [<000000008eb8d222>] vfs_get_tree+0x2d/0xe0 fs/super.c:1547 [<00000000367f5f92>] do_new_mount fs/namespace.c:2822 [inline] [<00000000367f5f92>] do_mount+0x97c/0xc80 fs/namespace.c:3107 [<0000000000ddb42a>] __do_sys_mount fs/namespace.c:3316 [inline] [<0000000000ddb42a>] __se_sys_mount fs/namespace.c:3293 [inline] [<0000000000ddb42a>] __x64_sys_mount+0xc0/0x140 fs/namespace.c:3293 [<00000000a60abc01>] do_syscall_64+0x73/0x220 arch/x86/entry/common.c:294 [<000000001bd2aaac>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
